Let x represent the unknown, and write an equation for the sentence. Do not solve. If 3 times a number is added to -9, the result is equal to 12 times the number.
A. 4x + (-9) = 12x
B. 12(3x - 9) = -9
C. 15x - 12x = 9
D. 3x + (-9) = 12x
Answer: D
Mathematics
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